hi,i use the LPC1768 ,
when i use the ADC , i found a problem , i use all the 8 ch,
i use the same signal to test all the ch,
the ch0 ch1 ch2 ch3 ch5 ch6 is OK,but the ch4 have problem
it show
not a line ,and i use oscillscope test the waveform ,it's ok ,not any problem.
this is my prj ,only the ch4 have problem !!!
void ADCInit( uint32_t ADC_Clk )
{
uint32_t i;
LPC_SC->PCONP |= (0x1<<12); /* ʹÄÜADCʱÖÓ . */
for ( i = 0; i < ADC_NUM; i++ )
{
ADCValue[i] = 0x0;
}
/*
* ÅäÖÃADC¹Ü½Å
*/
#if ADCCH0_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<14); //P0.23AD0.0
LPC_PINCON->PINSEL1 |= 0X01<<14;
LPC_GPIO0->FIODIR &=~(0x01<<23);//ADC0.0
#endif
#if ADCCH1_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<16); //P0.24ADC0.1
LPC_PINCON->PINSEL1 |= 0X01<<16;
LPC_GPIO0->FIODIR &=~(0x01<<24);//ADC0.1
#endif
#if ADCCH2_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<18); //P0.25ADC0.2
LPC_PINCON->PINSEL1 |= 0X01<<18;
LPC_GPIO0->FIODIR &=~(0x01<<25);//ADC0.2
#endif
#if ADCCH3_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<20); //P0.26ADC0.3
LPC_PINCON->PINSEL1 |= 0X01<<20;
LPC_GPIO0->FIODIR &=~(0x01<<26);//ADC0.3
#endif
#if ADCCH4_EN
LPC_PINCON->PINSEL3 &=~(0x03<<28); //P1.30AD0.4
LPC_PINCON->PINSEL3 |=0x03<<28;
LPC_GPIO1->FIODIR &=~(0x01<<30);//ADC0.4
#endif
#if ADCCH5_EN
LPC_PINCON->PINSEL3 &=~0xC0000000; //P1.31AD0.5
LPC_PINCON->PINSEL3 |=0xC0000000;
LPC_GPIO1->FIODIR &=~0x80000000;//ADC0.5
#endif
#if ADCCH6_EN
LPC_PINCON->PINSEL0 &=~(0X03<<6); //P0.3--ADC0.6
LPC_PINCON->PINSEL0 |=0X01<<7;
LPC_GPIO0->FIODIR &=~(0X01<<3);//ADC0.6
#endif
#if ADCCH7_EN
LPC_PINCON->PINSEL0 &=~(0X03<<4); //P0.2--ADC0.7
LPC_PINCON->PINSEL0 |=0X01<<5;
LPC_GPIO0->FIODIR &=~(0X01<<2);//ADC0.7
#endif
LPC_ADC->ADCR = ( 0x01 << 0 ) | /* SEL=1,select channel 0~7 on ADC0 */
((SystemFrequency/ADC_Clk-1)<<8) | /* CLKDIV = Fpclk / ADC_Clk - 1 */
( 0 << 16 ) | /* BURST = 0, Èí¼þ¿ØÖÆת»» */
( 1 << 21 ) | /* PDN = 1, ´¦ÓëÕý³£Ä£Ê½ */
( 0 << 24 ) | /* START = 0 ²»Æô¶¯ADת»» */
( 0 << 27 ); /* EDGE = 0 ÉÏÉýÑØÆô¶¯ */
#if ADC_INTERRUPT_FLAG
NVIC_EnableIRQ(ADC_IRQn);
LPC_ADC->ADINTEN = 0xFF; /* ͨµÀ0ת»»½áÊø²úÉúÖÐ¶Ï */
#endif
return;
}
uint32_t ADCRead( uint8_t channelNum )
{
#if !ADC_INTERRUPT_FLAG
uint32_t regVal, ADC_Data;
#endif
if ( channelNum >= ADC_NUM )
{
channelNum = 0; /* ÊäÈëchannelNum´óÓÚ8£¬ÔòÉèÖøòÎÊýΪ0 */
}
LPC_ADC->ADCR &= 0xFFFFFF00;
LPC_ADC->ADCR &=~(0x03<<25);
LPC_ADC->ADCR |= (1 << 24) | (1 << channelNum);
/* Ñ¡Ôñ¶ÔӦͨµÀÁ¢¼´Æô¶¯×ª»» */
#if !ADC_INTERRUPT_FLAG
while ( 1 ) /* µÈ´ýADCת»»Íê³É */
{
regVal = LPC_ADC->DR[channelNum];
if ( regVal & ADC_DONE )
{
break;
}
}
LPC_ADC->CR &= 0xF8FFFFFF; /* ֹͣADC */
/*
* Èç¹ûûÓз¢Éúoverrun´íÎó£¬Ôò±£´æÊý¾Ý
*/
if ( regVal & ADC_OVERRUN )
{
return ( 0 );
}
#if ADC_12BITS
ADC_Data = ( regVal >> 4 ) & 0xFFF;
#else
ADC_Data = ( regVal >> 6 ) & 0x3FF;
#endif
return ( ADC_Data ); /* ·µ»ØADC²ÉÑùÊý¾Ý */
#else
return ( channelNum );
#endif
}
void ADC_WOrk(void)
{
unsigned int Ins_read=0,Ins_re=0;
ADCRead(0);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[0];
ADCDataInput[0] = Ins_read*1320/4095;
ADCDataInput[0] =1200-ADCDataInput[0];
ADCRead(1);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[1];
ADCDataInput[1] = Ins_read*1320/4095;
ADCDataInput[1] =1200-ADCDataInput[1];
ADCRead(2);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[2];
ADCDataInput[2] = Ins_read*1320/4095;
ADCDataInput[2] =1200-ADCDataInput[2];
ADCRead(3);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[3];
ADCDataInput[3] = Ins_read*1320/4095;
ADCDataInput[3] =1200-ADCDataInput[3];
ADCRead(4);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[4];
Ins_read =Ins_read*1320/4095;
//ADCDataInput[4] =1200-Ins_read;
Ins_re =1200-Ins_read;
ADCDataInput[4] =(Ins_re+ADCDataInput[4]*7)/8;
ADCRead(5);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[5];
ADCDataInput[5] = Ins_read*1320/4095;
ADCDataInput[5] =1200-ADCDataInput[5];
ADCRead(6);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[6];
ADCDataInput[6] = Ins_read*1320/4095;
ADCDataInput[6] =1200-ADCDataInput[6];
}
